Rather than forcing each and every RPC task to grab the socket write
lock in order to send itself, we allow whichever task is holding the
write lock to attempt to drain the entire transmit queue.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Avoid memory starvation by giving RPCs that are tagged with the
RPC_TASK_SWAPPER flag the highest priority.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Both RDMA and UDP transports require the request to get a "congestion control"
credit before they can be transmitted. Right now, this is done when
the request locks the socket. We'd like it to happen when a request attempts
to be transmitted for the first time.
In order to support retransmission of requests that already hold such
credits, we also want to ensure that they get queued first, so that we
don't deadlock with requests that have yet to obtain a credit.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
One of the intentions with the priority queues was to ensure that no
single process can hog the transport. The field task->tk_owner therefore
identifies the RPC call's origin, and is intended to allow the RPC layer
to organise queues for fairness.
This commit therefore modifies the transmit queue to group requests
by task->tk_owner, and ensures that we round robin among those groups.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Remove the checks for whether or not we need to transmit, and whether
or not a reply has been received. Those are already handled in
call_transmit() itself.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When we shift to using the transmit queue, then the task that holds the
write lock will not necessarily be the same as the one being transmitted.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Fix up the back channel code to recognise that it has already been
transmitted, so does not need to be called again.
Also ensure that we set req->rq_task.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When storing a struct rpc_rqst on the slot allocation list, we currently
use the same field 'rq_list' as we use to store the request on the
receive queue. Since the structure is never on both lists at the same
time, this is OK.
However, for clarity, let's make that a union with different names for
the different lists so that we can more easily distinguish between
the two states.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Allow the caller in clnt.c to call into the code to wait for a reply
after calling xprt_transmit(). Again, the reason is that the backchannel
code does not need this functionality.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Separate out the action of adding a request to the reply queue so that the
backchannel code can simply skip calling it altogether.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Rather than waking up the entire queue of RPC messages a second time,
just wake up the task that was put to sleep.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When asked to wake up an RPC task, it makes sense to test whether or not
the task is still queued.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Add a helper that will wake up a task that is sleeping on a specific
queue, and will set the value of task->tk_status. This is mainly
intended for use by the transport layer to notify the task of an
error condition.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If the previous message was only partially transmitted, we need to close
the socket in order to avoid corruption of the message stream. To do so,
we currently hijack the unlocking of the socket in order to schedule
the close.
Now that we track the message offset in the socket state, we can move
that kind of checking out of the socket lock code, which is needed to
allow messages to remain queued after dropping the socket lock.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Rather than resetting state variables in socket state_change() callback,
do it in the sunrpc TCP connect function itself.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Since we will want to introduce similar TCP state variables for the
transmission of requests, let's rename the existing ones to label
that they are for the receive side.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Currently, we grab the socket bit lock before we allow the message
to be XDR encoded. That significantly slows down the transmission
rate, since we serialise on a potentially blocking operation.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If a message has been encoded using RPCSEC_GSS, the server is
maintaining a window of sequence numbers that it considers valid.
The client should normally be tracking that window, and needs to
verify that the sequence number used by the message being transmitted
still lies inside the window of validity.
So far, we've been able to assume this condition would be realised
automatically, since the client has been encoding the message only
after taking the socket lock. Once we change that condition, we
will need the explicit check.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
- MAINTAINERS reference fix for moved file
Reported by Joe Perches
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Merge tag 'auxdisplay-for-greg-v4.19-rc6' of https://github.com/ojeda/linux
Miguel writes:
"A trivial fix for auxdisplay
- MAINTAINERS reference fix for moved file
Reported by Joe Perches"
* tag 'auxdisplay-for-greg-v4.19-rc6' of https://github.com/ojeda/linux:
MAINTAINERS: fix reference to moved drivers/{misc => auxdisplay}/panel.c
Fix a deadlock in the new for 4.19 dax_lock_mapping_entry() routine.
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Merge tag 'libnvdimm-fixes2-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Dan writes:
"filesystem-dax for 4.19-rc6
Fix a deadlock in the new for 4.19 dax_lock_mapping_entry() routine."
* tag 'libnvdimm-fixes2-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
dax: Fix deadlock in dax_lock_mapping_entry()
Commit 51c1e9b554 ("auxdisplay: Move panel.c to drivers/auxdisplay folder")
moved the file, but the MAINTAINERS reference was not updated.
Link: https://lore.kernel.org/lkml/20180928220131.31075-1-joe@perches.com/
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
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Merge tag 'for-linus-20180929' of git://git.kernel.dk/linux-block
Jens writes:
"Block fixes for 4.19-rc6
A set of fixes that should go into this release. This pull request
contains:
- A fix (hopefully) for the persistent grants for xen-blkfront. A
previous fix from this series wasn't complete, hence reverted, and
this one should hopefully be it. (Boris Ostrovsky)
- Fix for an elevator drain warning with SMR devices, which is
triggered when you switch schedulers (Damien)
- bcache deadlock fix (Guoju Fang)
- Fix for the block unplug tracepoint, which has had the
timer/explicit flag reverted since 4.11 (Ilya)
- Fix a regression in this series where the blk-mq timeout hook is
invoked with the RCU read lock held, hence preventing it from
blocking (Keith)
- NVMe pull from Christoph, with a single multipath fix (Susobhan Dey)"
* tag 'for-linus-20180929' of git://git.kernel.dk/linux-block:
xen/blkfront: correct purging of persistent grants
Revert "xen/blkfront: When purging persistent grants, keep them in the buffer"
blk-mq: I/O and timer unplugs are inverted in blktrace
bcache: add separate workqueue for journal_write to avoid deadlock
xen/blkfront: When purging persistent grants, keep them in the buffer
block: fix deadline elevator drain for zoned block devices
blk-mq: Allow blocking queue tag iter callbacks
nvme: properly propagate errors in nvme_mpath_init
Thomas writes:
"A single fix for the AMD memory encryption boot code so it does not
read random garbage instead of the cached encryption bit when a kexec
kernel is allocated above the 32bit address limit."
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot: Fix kexec booting failure in the SEV bit detection code
Thomas writes:
"Three small fixes for clocksource drivers:
- Proper error handling in the Atmel PIT driver
- Add CLOCK_SOURCE_SUSPEND_NONSTOP for TI SoCs so suspend works again
- Fix the next event function for Facebook Backpack-CMM BMC chips so
usleep(100) doesnt sleep several milliseconds"
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
clocksource/drivers/timer-atmel-pit: Properly handle error cases
clocksource/drivers/fttmr010: Fix set_next_event handler
clocksource/drivers/ti-32k: Add CLOCK_SOURCE_SUSPEND_NONSTOP flag for non-am43 SoCs
Thomas writes:
"A single fix for a missing sanity check when a pinned event is tried
to be read on the wrong CPU due to a legit event scheduling failure."
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/core: Add sanity check to deal with pinned event failure
There is currently a warning when building the Kryo cpufreq driver into
the kernel image:
WARNING: vmlinux.o(.text+0x8aa424): Section mismatch in reference from
the function qcom_cpufreq_kryo_probe() to the function
.init.text:qcom_cpufreq_kryo_get_msm_id()
The function qcom_cpufreq_kryo_probe() references
the function __init qcom_cpufreq_kryo_get_msm_id().
This is often because qcom_cpufreq_kryo_probe lacks a __init
annotation or the annotation of qcom_cpufreq_kryo_get_msm_id is wrong.
Remove the '__init' annotation from qcom_cpufreq_kryo_get_msm_id
so that there is no more mismatch warning.
Additionally, Nick noticed that the remove function was marked as
'__init' when it should really be marked as '__exit'.
Fixes: 46e2856b8e (cpufreq: Add Kryo CPU scaling driver)
Fixes: 5ad7346b4a (cpufreq: kryo: Add module remove and exit)
Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 4.18+ <stable@vger.kernel.org> # 4.18+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Merge tag 'dma-mapping-4.19-3' of git://git.infradead.org/users/hch/dma-mapping
Christoph writes:
"dma mapping fix for 4.19-rc6
fix a missing Kconfig symbol for commits introduced in 4.19-rc"
* tag 'dma-mapping-4.19-3' of git://git.infradead.org/users/hch/dma-mapping:
dma-mapping: add the missing ARCH_HAS_SYNC_DMA_FOR_CPU_ALL declaration
Dmitry writes:
"Input updates for v4.19-rc5
Just a few driver fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: uinput - allow for max == min during input_absinfo validation
Input: elantech - enable middle button of touchpad on ThinkPad P72
Input: atakbd - fix Atari CapsLock behaviour
Input: atakbd - fix Atari keymap
Input: egalax_ts - add system wakeup support
Input: gpio-keys - fix a documentation index issue
Quite a few fixes for the Renesas drivers in here, plus a fix for the
Tegra driver and some documentation fixes for the recently added spi-mem
code. The Tegra fix is relatively large but fairly straightforward and
mechanical, it runs on probe so it's been reasonably well covered in
-next testing.
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Merge tag 'spi-fix-v4.19-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Mark writes:
"spi: Fixes for v4.19
Quite a few fixes for the Renesas drivers in here, plus a fix for the
Tegra driver and some documentation fixes for the recently added
spi-mem code. The Tegra fix is relatively large but fairly
straightforward and mechanical, it runs on probe so it's been
reasonably well covered in -next testing."
* tag 'spi-fix-v4.19-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: spi-mem: Move the DMA-able constraint doc to the kerneldoc header
spi: spi-mem: Add missing description for data.nbytes field
spi: rspi: Fix interrupted DMA transfers
spi: rspi: Fix invalid SPI use during system suspend
spi: sh-msiof: Fix handling of write value for SISTR register
spi: sh-msiof: Fix invalid SPI use during system suspend
spi: gpio: Fix copy-and-paste error
spi: tegra20-slink: explicitly enable/disable clock
A collection of fairly minor bug fixes here, a couple of driver specific
ones plus two core fixes. There's one fix for the new suspend state
code which fixes some confusion with constant values that are supposed
to indicate noop operation and another fixing a race condition with the
creation of sysfs files on new regulators.
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Merge tag 'regulator-v4.19-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Mark writes:
"regulator: Fixes for 4.19
A collection of fairly minor bug fixes here, a couple of driver
specific ones plus two core fixes. There's one fix for the new
suspend state code which fixes some confusion with constant values
that are supposed to indicate noop operation and another fixing a
race condition with the creation of sysfs files on new regulators."
* tag 'regulator-v4.19-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
regulator: fix crash caused by null driver data
regulator: Fix 'do-nothing' value for regulators without suspend state
regulator: da9063: fix DT probing with constraints
regulator: bd71837: Disable voltage monitoring for LDO3/4
A reasonably big batch of fixes due to me being away for a few weeks.
A fix for the TM emulation support on Power9, which could result in corrupting
the guest r11 when running under KVM.
Two fixes to the TM code which could lead to userspace GPR corruption if we take
an SLB miss at exactly the wrong time.
Our dynamic patching code had a bug that meant we could patch freed __init text,
which could lead to corrupting userspace memory.
csum_ipv6_magic() didn't work on little endian platforms since we optimised it
recently.
A fix for an endian bug when reading a device tree property telling us how many
storage keys the machine has available.
Fix a crash seen on some configurations of PowerVM when migrating the partition
from one machine to another.
A fix for a regression in the setup of our CPU to NUMA node mapping in KVM
guests.
A fix to our selftest Makefiles to make them work since a recent change to the
shared Makefile logic.
Thanks to:
Alexey Kardashevskiy, Breno Leitao, Christophe Leroy, Michael Bringmann,
Michael Neuling, Nicholas Piggin, Paul Mackerras,, Srikar Dronamraju, Thiago
Jung Bauermann, Xin Long.
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Merge tag 'powerpc-4.19-3' of https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Michael writes:
"powerpc fixes for 4.19 #3
A reasonably big batch of fixes due to me being away for a few weeks.
A fix for the TM emulation support on Power9, which could result in
corrupting the guest r11 when running under KVM.
Two fixes to the TM code which could lead to userspace GPR corruption
if we take an SLB miss at exactly the wrong time.
Our dynamic patching code had a bug that meant we could patch freed
__init text, which could lead to corrupting userspace memory.
csum_ipv6_magic() didn't work on little endian platforms since we
optimised it recently.
A fix for an endian bug when reading a device tree property telling
us how many storage keys the machine has available.
Fix a crash seen on some configurations of PowerVM when migrating the
partition from one machine to another.
A fix for a regression in the setup of our CPU to NUMA node mapping
in KVM guests.
A fix to our selftest Makefiles to make them work since a recent
change to the shared Makefile logic."
* tag 'powerpc-4.19-3' of https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
selftests/powerpc: Fix Makefiles for headers_install change
powerpc/numa: Use associativity if VPHN hcall is successful
powerpc/tm: Avoid possible userspace r1 corruption on reclaim
powerpc/tm: Fix userspace r13 corruption
powerpc/pseries: Fix unitialized timer reset on migration
powerpc/pkeys: Fix reading of ibm, processor-storage-keys property
powerpc: fix csum_ipv6_magic() on little endian platforms
powerpc/powernv/ioda2: Reduce upper limit for DMA window size (again)
powerpc: Avoid code patching freed init sections
KVM: PPC: Book3S HV: Fix guest r11 corruption with POWER9 TM workarounds
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Merge tag 'drm-fixes-2018-09-28' of git://anongit.freedesktop.org/drm/drm
Dave writes:
"drm fixes for 4.19-rc6
Looks like a pretty normal week for graphics,
core: syncobj fix, panel link regression revert
amd: suspend/resume fixes, EDID emulation fix
mali-dp: NV12 writeback and vblank reset fixes
etnaviv: DMA setup fix"
* tag 'drm-fixes-2018-09-28' of git://anongit.freedesktop.org/drm/drm:
drm/amd/display: Fix Edid emulation for linux
drm/amd/display: Fix Vega10 lightup on S3 resume
drm/amdgpu: Fix vce work queue was not cancelled when suspend
Revert "drm/panel: Add device_link from panel device to DRM device"
drm/syncobj: Don't leak fences when WAIT_FOR_SUBMIT is set
drm/malidp: Fix writeback in NV12
drm: mali-dp: Call drm_crtc_vblank_reset on device init
drm/etnaviv: add DMA configuration for etnaviv platform device
The Debian guys have been pushing on our port and found some unversioned
symbols leaking into modules. This PR contains a single fix for that
issue.
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Merge tag 'riscv-for-linus-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux
Palmer writes:
"A Single RISC-V Update for 4.19-rc6
The Debian guys have been pushing on our port and found some
unversioned symbols leaking into modules. This PR contains a single
fix for that issue."
* tag 'riscv-for-linus-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
RISC-V: include linux/ftrace.h in asm-prototypes.h
